/*
 ***************************************************************************************
 *  Copyright (C) 2006 EsperTech, Inc. All rights reserved.                            *
 *  http://www.espertech.com/esper                                                     *
 *  http://www.espertech.com                                                           *
 *  ---------------------------------------------------------------------------------- *
 *  The software in this package is published under the terms of the GPL license       *
 *  a copy of which has been included with this distribution in the license.txt file.  *
 ***************************************************************************************
 */
package com.espertech.esper.common.client.soda;

import java.io.StringWriter;

/**
 * Negates the contained-within subexpression.
 * <p>
 * Has a single child expression to be negated.
 */
public class NotExpression extends ExpressionBase {
    private static final long serialVersionUID = -1247919838946739236L;

    /**
     * Ctor.
     *
     * @param inner is the expression to negate
     */
    public NotExpression(Expression inner) {
        this.addChild(inner);
    }

    /**
     * Ctor - for use to create an expression tree, without child expression.
     */
    public NotExpression() {
    }

    public ExpressionPrecedenceEnum getPrecedence() {
        return ExpressionPrecedenceEnum.NEGATED;
    }

    public void toPrecedenceFreeEPL(StringWriter writer) {
        writer.write("not ");
        this.getChildren().get(0).toEPL(writer, getPrecedence());
    }
}
